[CMake] issue with CHECK FUNCTION EXISTS() and friends

[Thompson, David C]

> there is the family of CHECK_XXX_EXISTS() macros in the cmake Modules.  
> They work quite well but I have a problem with them.  
> If the item which was searched for has been found HAVE_FOO is set to "1".  
> This is ok and works in all cases:  
> in config.h.cmake:  
>  #define HAVE_FOO ${HAVE_FOO}  

Doesn't

   #cmakedefine HAVE_FOO

in config.h.cmake do the right thing?

        David
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